Nemožno nastaviť hodnotu vyberte prvok vo vnútri komponentu s Enzýmom

Snažila som sa chcete nastaviť hodnotu pre select prvku vo vnútri Dropdown zložky, ale test udržuje nedarí.

Tu je codesandbox zložky na test.

it('should execute onChange once and change value to "item2"', () => {
        const onChangeMock = jest.fn();
        const wrapper = mount(
            <Dropdown{ ...args } 
                onChange={ onChangeMock } 
                listItems={ ['item1', 'item2', 'item3'] } />
        );

    
        wrapper.find('select').simulate('change', { value: 'item2' });

        console.log(wrapper.debug());
        console.log(wrapper.find('select').props());
        
        expect(wrapper.find('select').props().value).toBe('item2');
        expect(onChangeMock.mock.calls.length).toBe(1);
    });

Výstup po spustení npm run test:

 expect(received).toBe(expected) // Object.is equality
 Expected: "item2"
 Received: undefined

 51 |         console.log(wrapper.find('select').props());
 52 |         
 53 |         expect(wrapper.find('select').props().value).toBe('item2');
    |                                                      ^
 54 |         expect(onChangeMock.mock.calls.length).toBe(1);
 55 |     });
 56 | });

console.log
    <Dropdown id="" name="" label="" placeholder="" errorMessage="" valid={false} required={false} listItems={{...}} onChange={[Function: mockConstructor] { _isMockFunction: true, getMockImplementation: [Function (anonymous)], mock: Object [Object: null prototype] { calls: [ [ SyntheticBaseEvent { _reactName: 'onChange', _targetInst: [Object], type: 'change', nativeEvent: [Object], target: [Object], currentTarget: null, eventPhase: undefined, bubbles: undefined, cancelable: undefined, timeStamp: 1637655017281, defaultPrevented: undefined, isTrusted: undefined, isDefaultPrevented: [Function: functionThatReturnsFalse], isPropagationStopped: [Function: functionThatReturnsFalse], value: 'item2', _dispatchListeners: null, _dispatchInstances: null } ] ], instances: [ undefined ], invocationCallOrder: [ 1 ], results: [ Object [Object: null prototype] { type: 'return', value: undefined } ] }, mockClear: [Function (anonymous)], mockReset: [Function (anonymous)], mockRestore: [Function (anonymous)], mockReturnValueOnce: [Function (anonymous)], mockResolvedValueOnce: [Function (anonymous)], mockRejectedValueOnce: [Function (anonymous)], mockReturnValue: [Function (anonymous)], mockResolvedValue: [Function (anonymous)], mockRejectedValue: [Function (anonymous)], mockImplementationOnce: [Function (anonymous)], mockImplementation: [Function (anonymous)], mockReturnThis: [Function (anonymous)], mockName: [Function (anonymous)], getMockName: [Function (anonymous)] }}>
      <div className="med-dropdown">
        <label htmlFor="" className="med-dropdown__label">
           (Optional)
        </label>
        <select id="" name="" className="med-dropdown__select false" defaultValue={0} onChange={[Function: mockConstructor] { _isMockFunction: true, getMockImplementation: [Function (anonymous)], mock: Object [Object: null prototype] { calls: [ [ SyntheticBaseEvent { _reactName: 'onChange', _targetInst: [Object], type: 'change', nativeEvent: [Object], target: [Object], currentTarget: null, eventPhase: undefined, bubbles: undefined, cancelable: undefined, timeStamp: 1637655017281, defaultPrevented: undefined, isTrusted: undefined, isDefaultPrevented: [Function: functionThatReturnsFalse], isPropagationStopped: [Function: functionThatReturnsFalse], value: 'item2', _dispatchListeners: null, _dispatchInstances: null } ] ], instances: [ undefined ], invocationCallOrder: [ 1 ], results: [ Object [Object: null prototype] { type: 'return', value: undefined } ] }, mockClear: [Function (anonymous)], mockReset: [Function (anonymous)], mockRestore: [Function (anonymous)], mockReturnValueOnce: [Function (anonymous)], mockResolvedValueOnce: [Function (anonymous)], mockRejectedValueOnce: [Function (anonymous)], mockReturnValue: [Function (anonymous)], mockResolvedValue: [Function (anonymous)], mockRejectedValue: [Function (anonymous)], mockImplementationOnce: [Function (anonymous)], mockImplementation: [Function (anonymous)], mockReturnThis: [Function (anonymous)], mockName: [Function (anonymous)], getMockName: [Function (anonymous)] }} onFocus={[Function: onFocus]} onBlur={[Function: onBlur]} disabled={[undefined]}>
          <option disabled={true} value={0} />
          <option value="item1">
            item1
          </option>
          <option value="item2">
            item2
          </option>
          <option value="item3">
            item3
          </option>
        </select>
      </div>
    </Dropdown>